Kristof Tirez

Kristof Tirez
Flemish Institute for Technological Research | VITO · Sustainable Chemistry

Doctor of Science Chemistry

About

53
Publications
12,289
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Introduction
Since 1997, Kristof works as a researcher and project leader in the inorganic analytical department of Vito. His main experience and research interests are situated in the quantitative determination and speciation of elements in a variety of matrices. Besides, he acts as a science - policy bridge person and analytical expert for different Flemish agencies (OVAM, VMM, VLM, Department Omgeving) dealing with environmental regulatory monitoring. He actively participates as analytical expert in the technical committees of the Public Waste Agency of Flanders (OVAM), the Flemish Department of Environment (DO) and in CEN technical committees for the development of standard methods for the analysis of inorganic compounds in environmental and other matrices.

Publications

Publications (53)
Article
Full-text available
A new comprehensive analytical approach based on single-particle inductively coupled plasma-sector field mass spectrometry (spICP-SFMS) and electrical asymmetric-flow field-flow-fractionation combined with multi-angle light scattering detection (EAF4-MALS) has been examined for the characterization of galactosamine-terminated poly(N-hydroxyethyl ac...
Article
Development of analytical methods for the characterization (particle size determination, chemical identification, and quantification) of the low μm-range microplastics (MPs; 1-10 μm) and nanoplastics (NPs; 1 nm to 1 μm) in air-coarse (PM10; <10 μm), fine (PM2.5; <2.5 μm) and ultrafine (PM1; <1 μm) particulate matter-is a quickly emerging scientific...
Article
The applicability of the Safe-by-Design (SbD) concept was investigated during development of oxygen carriers (OCs) for Chemical Looping Combustion (CLC) installations; the newly developed OCs are complex, fluidizable metal-oxides. SbD assesses Health Safety and Environmental (HSE) risks at an early stage of product development. Hereto, the impact o...
Conference Paper
Full-text available
As the diversity of nanomaterials is wide and their size can vary by 2 orders of magnitude (1−100 nm), the development of new and advanced analytical tools for their in-depth characterization is of paramount importance, allowing a fundamental understanding of their structure, further alteration and degree of chemical surface functionalization. Here...
Article
Development of analytical methods for the characterization (particle size determination, identification, and quantification) of the micro- and nanoscale plastic debris in the environment is a quickly emerging field and has gained considerable attention, not only within the scientific community, but also on the part of policy makers and the general...
Article
As a result of their unique physical, chemical and/or biological properties, the use of engineered nanoparticles (ENPs) is growing very rapidly. Iron oxide nanoparticles (IONPs) are of particular interest owing...
Article
Full-text available
Background: Food-grade TiO2 (E171 in the EU) is widely used as a coloring agent in foodstuffs, including sweets. Chronic dietary exposure raises concerns for human health due to proinflammatory properties and the ability to induce and promote preneoplastic lesions in the rodent gut. Characterization of intestinal TiO2 uptake is essential for asses...
Article
The occurrence of microplastics in many, if not all environmental compartments is a matter of increasing concern and deserves proper attention. However, there is still a lack of analytical tools...
Article
Full-text available
H2O2 was demonstrated to narrow the size distribution and decrease the size of CuO and hydrous FeOOH (2-line ferrihydrite) nanoparticles under conditions of high supersaturation. We introduce oxidation-assisted alkaline precipitation (Ox-AP) and compare it to traditional alkaline precipitation (AP). While for AP, a metal salt solution (e.g., CuCl2)...
Article
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A new prototype air–liquid interface (ALI) exposure system, a flatbed aerosol exposure chamber termed NAVETTA, was developed to investigate deposition of engineered nanoparticles (NPs) on cultured human lung A549 cells directly from the gas phase. This device mimics human lung cell exposure to NPs due to a low horizontal gas flow combined with cell...
Article
A new prototype air-liquid interface (ALI) exposure system, a flatbed aerosol exposure chamber termed NAVETTA, was developed to investigate deposition of engineered nanoparticles (NPs) on cultured human lung A549 cells directly from the gas phase. This device mimics human lung cell exposure to NPs due to a low horizontal gas flow combined with cell...
Article
Despite many investigations have focused on the pristine toxicity of gold nanoparticles (GNPs), little is known about the outcome of co-exposure and interaction of GNPs with heavy metals which can possibly detoxify or potentiate them. Here, the combined exposure of nickel (II) sulphate (NiSO4) and GNPs on the maturation response of dendritic cells...
Article
Full-text available
Undoubtedly, the most important advance in the environmental regulatory monitoring of elements of the last decade is the widespread introduction of ICP-mass spectrometry (ICP-MS) due to standards developed by the European Committee for Standardization. The versatility of ICP-MS units as a tool for the determination of major, minor and trace element...
Article
Full-text available
Inorganic arsenic species in ambient particulate matter (PM10 and PM2.5) have been determined in an urban area, in the vicinity of a metallurgical industrial plant. The developed high performance liquid chromatography inductively coupled plasma mass spectrometry (HPLC/ICP-MS) method allows monitoring of particulate As(III) and As(V)-species, with a...
Article
RATIONALEThe phosphorylation of proteins is one of the most important post-translational modifications in nature. Knowledge of the quantity or degree of protein phosphorylation in biological samples is extremely important. A combination of liquid chromatography (LC) and inductively coupled plasma mass spectrometry (ICP-MS) allows the absolute and r...
Article
Reversible phosphorylation is one of the most important post-translational modifications in mammalian cells. Because this molecular switch is an important mechanism that diversifies and regulates proteins in cellular processes, knowledge about the extent and quantity of phosphorylation is very important to understand the complex cellular interplay....
Article
Full-text available
Monitoring of soil organic carbon (SOC) and pH is needed to manage soil protection and tackle possible degradation in support of, i.e, the upcoming European Soil Framework Directive. Harmonized monitoring procedures and protocols produced under the auspices of the International Organization for Standardization (ISO) and the European Committee for S...
Conference Paper
Full-text available
: To date, there is obviously a need for the systematic analysis of precious metals and REE in waste fractions to assess the resource potential and the fate of these valuable elements into recyclable fractions and residues. The aim of this work was the development of a multi-element screening method for the determination of Ag, W and Y in solid (wa...
Article
Full-text available
This paper describes a user-friendly method for bromate determination that can be implemented easily on any inductively coupled plasma-mass spectrometer present in drinking water laboratories. The method uses low pressure liquid chromatography coupled to an ICP-quadrupole mass spectrometry instrument (ICP-QMS) or an ICP-sector field mass spectromet...
Thesis
Since its introduction in 1980, ICP-MS evolved from a lab-built instrument to a family of commercially available analytical techniques, ranging from single-collector quadrupole mass filter units (ICP-QMS) to single-collector and multi-collector sector-field based ICP-MS instruments with high mass resolution capabilities. The versatility of ICP-MS u...
Article
In this study we describe the development of an alternative methodology for hazard characterization of waste materials. Such an alternative methodology for hazard assessment of complex waste materials is urgently needed, because the lack of a validated instrument leads to arbitrary hazard classification of such complex waste materials. False classi...
Article
The Hazardous Waste Directive (HWD, Council Directive 91/689/EC, 1991) provides a framework for classification of hazardous waste, based on 15 Hazard (H)-criteria. For complex wastes the HWD foresees the application of toxicity tests on the waste material itself to assess its toxic properties. However, these proposed test methods often involve mamm...
Article
In spite of increasing efforts to reduce nitrogen inputs into ground water from intensive agriculture, nitrate (NO(3)) remains one of the major pollutants of drinking-water resources worldwide, with NO(3) levels approaching the defined limit of 50 mg l(-1) in an increasing number of water bodies. Determining the source(s) of contamination in water...
Article
The use of various isotopes (dN, dO & dB) to identify the sources of nitrate (NO3 ) present in natural waters is described. Then a new guideline of how to apply the multi-isotope approach is presented. This guideline is written for policy makers and scientists who are involved in the different steps and processes related to nitrate contaminated wat...
Article
Full-text available
The accuracy of the determination of Cr(VI) in ambient particulate matter remains a challenge from the point of view of minimal Cr species interconversion. Knowledge of this method induced oxidation and reduction is particularly relevant for the determination of Cr(VI) in ambient particulate matter, as the level of observed Cr(III) oxidation (avera...
Article
Full-text available
Nickel speciation and fractionation using a multidisciplinary approach are discussed for different particulate matter samples collected in industrial and rural atmospheres. The technologies utilized in this research span from X-ray Absorption Near Edge Structure (XANES) and X-Ray Diffraction (XRD) to a wet chemistry sequential leaching assay (inclu...
Conference Paper
Full-text available
The aim of this work was the application of a rapid and ultrasensitive uranium isotopic analysis for evaluating the source of uranium in environmental samples. The analyses were performed using a sector field ICP-MS. A high efficiency sample introduction system equipped with a high-purity PFA Teflon flow path was used to provide resistance to the h...
Article
The aim of our research was to compare δ11B measurements performed with thermal ionization mass spectrometry (TIMS) and sector field-inductively coupled plasma-mass spectrometry (SF-ICP-MS) and evaluate the feasibility of implementing stable isotope methods in European water framework directive (WFD) monitoring programs. The comparison was based on...
Article
Full-text available
Glass polycapillary optics are shown to be easy to use focusing optics for bending magnet XAS stations. These achromatic optics have acceptances of several mm horizontally and vertically, while their angular acceptances can be matched to the source divergence by the design of the polycapillary. A polycapillary half-lens based focusing system was su...
Article
Full-text available
A European standard for the determination of Cr(vi) in solid material has been elaborated in the framework of an international co-operation and finally validated in the course of an interlaboratory comparison. The procedure is based on the alkaline digestion prescribed by EPA method 3060A followed by ion chromatography and determines an operational...
Article
Full-text available
To determine the heavy metal content in soil samples at contaminated locations, a static and time consuming procedure is used in most cases. Soil samples are collected and analyzed in the laboratory at high quality and high analytical costs. The demand by government and consultants for a more dynamic approach and by customers requiring performances...
Article
Full-text available
The accuracy of the determination of hexavalent chromium (Cr6+) in solid matrices remains a challenging field of effort and improvement. An alkaline digestion (0.5 M NaOH–0.28 M Na2CO3) followed by ion chromatography and spectrophotometric determination by post-column derivatisation with 1,5-diphenylcarbazide (DPC) provides accurate and reproducibl...
Article
A risk assessment study of the air quality in the surrounding of roads covered with slags coming from the non-ferrous metal industry was performed. A monitoring campaign was carried out at three locations in Flanders by collecting the PM10 fraction and the total suspended particulates (TSP) of the airborne dust particles, entrapping heavy metals, o...
Article
Full-text available
A simple, rapid and accurate panoramic method based on inductively coupled plasma (quadrupole) mass spectrometry (ICP-MS) for the determination of trace metals in water samples has been developed. On the basis of an appropriate selection of the isotopes monitored and the combination of internal standardization with correction equations to overcome...
Article
Full-text available
A simple, rapid and accurate panoramic method based on inductively coupled plasma (quadrupole) mass spectrometry (ICP-MS) for the determination of trace metals in water samples has been developed. On the basis of an appropriate selection of the isotopes monitored and the combination of internal standardization with correction equations to overcome...
Article
Full-text available
The mercury mass fraction has been determined by atomic fluorescence spectrometry (AFS) in the framework of the project "Certification of a reference material (trace elements in fly ash) in replacement of BCR CRM 176". Calculation of the uncertainty budget, as described in this manuscript, emphasizes a practical and realistic approach to estimation...
Chapter
Full-text available
The demand of government and consultants to have a fast and reliable system to determine the heavy metal content in soil samples is still growing. The interest in analysis and control of soil samples on the field leads to the evaluation of the applicability of ED-XRF (energy–dispersive X-ray spectrometry) as a field analytical technique. In this pa...
Article
Full-text available
Limited information is available on the effects of contaminant aging (i.e., the contact time of Cd with the soil) on Cd transport in soils. We conducted displacement experiments in which indigenous Cd and freshly applied Cd were leached simultaneously from undisturbed samples of three Spodosol horizons. Sorption of Cd was described using Freundlich...
Article
Full-text available
For the evaluation of different analytical methods the best achievable final uncertainty can be used as the criterion. Evaluation of an analytical method on this basis includes the magnitude and also the robustness of the uncertainty budget. This evaluation was applied to laboratory-scale migration experiments on soil columns. These experiments wer...
Article
Full-text available
Microbial selenium reduction was investigated for application in the removal of selenium from industrial waste water. This paper presents the results of the development of a routine ICP-MS method for the determination of inorganic selenium species in microbial-treated industrial waste water. For the speciation of water soluble inorganic selenium sp...
Article
Full-text available
In laboratory-scale migration experiments a tracer (stable 111 Cd isotope) is added on top of a contaminated soil and the column effluents are fractionally collected. This paper describes an analytical method for the simultaneous low level quantitative determination with inductively coupled plasma mass spectrometry (ICP-MS) of contaminant (natural...

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Projects

Projects (3)
Archived project
Project
Get A Met aims to implement an integrated proof-of-concept for the selective recovery of critical raw materials (CRM), and more specifically metals and metalloids contained in industrial wastewaters, combining the features of economic, modular, high capacity, robust, and reusable. The core of Get A Met is a groundbreaking electrochemical process, namely gas-diffusion electrocrystallization. This process will be combined with advanced speciation knowledge, pre-treatment with membrane electrolysis to tune the streams into the right specifications, and innovative carbon ion-imprinted materials to add on selectivity. Altogether, Get A Met intends to develop an effective technological solution to enable the recovery of dilute critical raw materials from industrial wastewaters, which overcomes the limitations of traditional and best-available technologies. Starting date 01/02/2016 Project duration 4 years